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Morphology of cyclosporine nephrotoxicity in the rat
Abstract:
Cyclosporine (CSA) nephrotoxicity was investigated in the rat. Morphologically, CSA nephrotoxicity is characterized by the following features: (a) Tubular inclusion bodies (TIB) corresponding to autolysosomes and giant mitochondria; (b) tubular vacuolization (TV) due to dilatation of the endoplasmatic reticulum; (c) tubular microcalcification (TM); and (d) tubular regeneration (TR). The morphologic features are limited to (a and b) or predominate (c and d) in the proximal tubule. CSA tubulopathy as defined above is dose dependent, independent of the route of a drug administration, develops quickly (within a week), is reversible after CSA withdrawal, is more pronounced in male than in female rats and shows no clear cut differences in various rat strains. Body weight shows a dose dependent reduction. The functional changes are usually slight. No significant correlation exists between functional changes and morphologic lesions. The type of CSA nephrotoxicity in the rat is very similar to CSA-tubulopathy in man but associated with less severe functional changes.
Insights
Cyclosporine (CSA) nephrotoxicity in rats shows dose-dependent tubular damage, including inclusion bodies and vacuolization, primarily in proximal tubules. These effects are rapid, reversible, and more severe in males, mirroring human CSA tubulopathy.
Area of Science:
- Nephrology
- Toxicology
- Experimental Pathology
Background:
- Cyclosporine (CSA) is a vital immunosuppressant with known nephrotoxicity.
- Understanding the specific mechanisms and morphological changes of CSA-induced kidney damage is crucial for patient management.
Purpose of the Study:
- To investigate the morphological and functional characteristics of Cyclosporine (CSA) nephrotoxicity in a rat model.
- To compare the observed nephrotoxicity in rats with human cases of CSA tubulopathy.
Main Methods:
- Rats were administered varying doses of Cyclosporine (CSA).
- Kidney tissues were examined morphologically for characteristic lesions.
- Functional renal parameters were assessed.
- Effects were analyzed based on dose, sex, and rat strain.
Main Results:
- Morphological changes included tubular inclusion bodies (autolysosomes, giant mitochondria), tubular vacuolization, microcalcification, and regeneration, predominantly in proximal tubules.
- Nephrotoxicity was dose-dependent, rapid (within a week), reversible upon drug withdrawal, and more pronounced in male rats.
- Body weight reduction was dose-dependent; functional changes were generally mild and showed no significant correlation with morphological lesions.
Conclusions:
- Rat model exhibits Cyclosporine (CSA) nephrotoxicity with distinct morphological features similar to human CSA tubulopathy.
- While morphologically similar, the rat model shows less severe functional impairment compared to humans.